Grinding machine



March 17, 1,925n

M. s. CUMNER Er M @BINDING CHINE Fild Das, 51

192 13 shetswnnt 1 March 17, 192.5..

M. s. CUMNER l-:T AL

GRINDING IACHINE l315.5 Sheets-Sheet 2 Filed DBO 31 1920 March 17, 1925. 1,530,242

M. S. CUMNER ET AL GRINDING MACHINE Filed Dec. s1 1929 13 snee-@Sesma s March 17, 1925.

M. S. CUMNER ET AL GRINDING MACHINE Filed DBG' 3l, 1920 l3- Sheets-Sheet 4 March 17, 1925.

M. s. cuMNER E1' AL GRINDING moana:

Filed DGQ. 31 1929 lll Il March 17, 1925.

` M. S. CUMNER ET AL GRINDING MACHINE 19240 13 Sheets-Shoe?l f gs Sg March 17, 1925.

M. S. CUMNER ET All..-

GRINDING HACHIHE Filed Dec. 31 1920 13 Sheets-Shanl Slg# M. S. v'CIUMNERE'I' AL Much 11, 192s.

@alumno Maarn Filed Doc. 31 1920 13 Shntsf-Sheet 1-1 Mmh 11, 192s;y

' 1,530,242 M. S. CUMNER ET' AL GRINDING IACHINE Filed D96. 51 1920 13 Shouts-Sheet 12 March 17, 1925.

M. S. CUMNER ET AL GB'INDING MACHINE Filed Ders. 31 1920 13 Sheets-Sheet 13 INVENTOR Mag/Mew .5. C umner FrcJer/c/r W BY I l TroRNEY Patented Mar. 17, 1925.

UNITED STATES PATENT OFFICE.

MATTHEW S. CUMNER, OF BROOKLYN, NEW YORK, AND FREDERICK W. GEISSEN- i HAINER, OF FREEHOLD, NEW JERSEY.

GRINDING MACHINE.

Application led December' 31, 1920. Serial No, 484,194.

To all whom t 'may concern. v

Be it known that we, MATTHEW S. CUM- Nnn, a citizen of the United States of America, and a residentof Brooklyn, in the county of Kings and State of New York, and FREDERICK W. GEISSENHAINER, a citizen of the United States of America, and a resident of Freehold,Mo nmouth County, and State of New Jersey, haveinvented certain new and useful Improvements in Grinding Machines, of which the following is a speci-- cation, reference being had to the accompanying drawings, forming a. part thereof.

Our invention relates -to new and useful improvements in cutting and grinding machines and its. object is to` provide a simple, substantial and satisfactory machine by means of which hobs may be easily and quickly cut with a high degree of accuracy by an abrasive wheel or wheels or other rotary cutting tool.

lt is an object of our invention to provide a machine which may also be used for grinding threads or screws with a high degree of accuracy.

A further object is to providea machine in which the causes of inaccuracy in mechanisms of this type as have been known heretofore, shall' be eliminated, so that hobs or screws ground thereon may approach perfection. A machine embodying this invention may therefore be employed and is adapted to be employed in the making of master hobs or screws or hardened master gauges.

Another object of this invention is to provide a machine of the character described in which the parts may be readily controlled, manipulated and adjusted and in which re placements may readily be made if and as desired.

fith the foregoing and other objects in view, which will be apparent to one skilled in the art as the description proceeds, our invention resides-in the combination and ar rangement of parts and in the details of oonstruction described in the following speciication and particularly pointed out in the claims appended hereto, one embodiment of said invention being illustrated' in the accompanying drawings. It is to be understood, however, that we do not limit ourselves to the precise embodiment disclosed herewith as changes can be made wit-hin the sco-pe of what is claimed without departing from the spirit of the invention. Werintend no limita-tions other than those imposed by the claims.

Referring to the drawings Figure 1 is a front elevational view of a grinder embodying our invention.

Figure 2 is an end elevational view of the machine illustrated in Figure 1.

Figure 3 is a fragmentary rear elevation, partly in section.

Figure 4 is a plan view of the machine of Figure 1.

Figure 5 is a transverse sectional elevation just forward of the carriage on the line 5-'5 of Figure 4.

Figure 6 is a longitudinal section through the head or driving portion of the machine.

Figure 7 i's an elevational longitudinal section through the axis of the headstock on the line 7 7 of Figure 4. V

Figure 8fis a transverse 'vertical section through the rear of the head stock on the line 8-8 of Figure 7 Figure 9 is a horizontal transverse 'section through the driving mechanism on the liuc 9 9 of Figure 12.

Figure 10 vis a horizontal transverse section on the line 10-10 of Fig'. 12.

Figure 11 is a plan View of the machine of Fig. 1, partly in section.

Figure 12 is a vertical transverse section through the driving spindle on the line 12--12 of Fig. 6.

Figure 13 isa partial vertical transverse section of the actuating gear box on the line 13-13 of Fig. 6.

Figure 14 is a detail of the automatic reversing mechanism showing a rear vertical longitudinal View partly in section on the line 14-14 of Fig. 12.

Figure 15 is an exploded perspective view of a detail of a clutch assembl Figure 16 is a detail sectiona view of the line 23-23 of Fig. 11. y

Figure 17 is an elevation, in place, of a rotary cutting tool, which may be substituted for the grinding wheel.

Fig. 1S is a horizontal sectional view of the rotary cutting tool block.

Fig. 19, is a horizontal sectional view of a gmodil'led form of rotary cutting tool block.

Figure 2O isa plan view of the grinder wheel and a portion of the wheel dressing or trimming mechanism.

Figure 21 is a front elevational View on an enlarged scale of the wheel trimming mechanism.

Figure 22 is a transverse elevational view of the wheel trimming mechanism and adjacent parts.

Figure 23 is a transverse sectional elevation taken substantially on line 2 3-23 of Figure 21. l

Figure 24 is a detail sectional elevation of a clamping screw taken substantially on line 24-24 of Figure 22.

Similar reference numerals relate to similar parts throughout the several views.

15 designates the bed of the grinding machine which is preferably supported on legs 16 and on a base 17 which comprises a motor compartment accessible through an opening closed by the door 18.

The bed 15 is constructed to form two parallel rails 19 and 20, the former being a V-rail and the latter having a flat surface.

Movable longitudinallv on the rails 19 and 20 is a frame 1 to which is attached a bracket 2. The bracket 2 has a nut 3 which fits a screw 4, the nut 3 being' affixed to the bracket by bolts 3a, 3a (Fig. 8)` and thus serving to move the frame 1 as the screw 4 rotates and the nut 3 rides along the screw. The screw 4 is detachably secured to the spindle shaft 46 in any positive way to rotate therewith and on its outer end is held in positive alignment with said shaft by a journal as at 4a.

Adjustably mounted on the frame 1 are transverse tracks 5, 5 on which is slidably carried a transversely operable carriage 6 which may be moved in and out on the tracks 5 by means of a screw 7 operable by a handle 8, the movement of which may be accurately adjusted by reason of a micrometer disc 9. A longitudinal adjustment for the carriage 6 is provided by means of the track 6a (Fig. 2),.

Mounted on the bed 15 is a head stock having a rotating spindle 21 and a face plate 22.

Also mounted on the bed 15 is a tail stock 1() having a dead spindle 11. The tail stock is longitudinally adjustable` on auxiliary guides, 15, 15", and clamped in position by theaction of a handle 13. A transverse track 14 provides for a limited transverse adjustment under the action of adjusting screws 12, 12.

The carriage 6 carries a driven rotatable grinding wheel 50 for grinding hobs or screws as will be later described in detail. Any other rotatable cutting tool may also be use-d.

It is apparent from the foregoing de- -to one end of which a water scription, that a rotation of the screw 4 will actuate the nut 3 and move the bracket 2 with the attached frame 1 and a carriage 6 `longitudinally between the spindles 21 and 11. The grinding wheel 50 will move along a gauge or other piece of work held between the spindles 21 and 11, at a rate exactly proportional 'tol thepitch and rotative speed of the screw 4, giving relative movement between the cutting tool and the work. Consequently, supposing the work heldin the spindles to be rotating with the exact speed of the screw 4, as will be later set forth in detail, the grinding wheel 50 for example, may by manual transverse actuation, be made to cut a hob or screw having exactly the pitch of the screw 4 but of any desired diameter. By the use of this machine hobs and screws of 'practically perfect pitch may be ground. The hobs may be, and preferably are, rough cut byN usual methods or by the use of a cutting tool 126 (Fig. 17) before being hardened and finished by grinding on this machine.n

It is apparent that by the usual'wllknown expedient of holding the part to be ground in a chuck in place of on the spindle 21, internal hob or screw threads may be ground with the same accuracy.

The screw 4 and the nut 3 are removable and others of Various desired pitches may be substituted if other pitches are desired on the gauges or hobs to be ground.

As has been stated, there is a motor compartment in the base 17 in which is, preferably, an electric motor driving a chain 23. which in turn rotates a drive shaft 24 pump is connected as is usual.

Adjacent the other end of shaft 24 is a worm 25 between the supporting journals 25a, 25a. The worm 25 (Figs. 7, 6 and 12) is in mesh with a worm gear 26 on a shaft 3 0. Coacting with the worm gear 26 is a' clutch having the engaging toothed ends 26EL and 26h, the former being normally in engagement with a coacting clutch portion of a bevel gear 27 which meshes with a bevel gear 28 ailixed to a shaft 29 on which is a series 'of gears 29a, 29h, 29c adapted to mesh one at a time, selectively withcorresponding gears 30a', 30", 30c slidably affixed to a shaft 30 and operable by the handle or lever 31 as is usual with a set of selective sliding gears to give varying speed of the shaft 30.

Also` slidably affixed to the shaft 30 is a gear 33 in mesh with a gear 34, (Fig. 13)

vboth being carried in a frame 32 operable by a handle 35 to bring the gear 34 in 4mesh with any one of a series of gears 36a, 36,", 36, 366,366,362 affixed to a shaft `36 to which a bevel gear 37 is aIixed and in operative mesh with a bevel gear 38 freely mounted on a shaft 39. To the latter shaft is also aixed a bevel gear 40 in mesh with a bevel gear 41 which drives a vertical shaft to the head of which a bevel gear 42 is affixed and is in mesh with the freely mounted bevel gears 43 and 44, rotating them in opposite directions when actuated. Each of these gears 43, 44, has a clutch hub. j

A clutch collar 45 keyed or .otherwise slidably affixed to the spindle shaft 46 may be thrown into mesh with the clutch hub of either of said gears 43 or 44, and may thus actuate the spindle shaft in either forward or backward direction when the spindle shaft 46 is actuated.

A clutch collar 47 keyed or otherwise slidably affixed to the shaft 39 may be brought into engagement with a clutch hub on the freely mounted gear 38 by a shifting fork* 48 on the shift lever 49 which also has forks 49', 49, to actuate the selective connection either between the worm gear 26 and the bevel gear 27 by reason of the clutch member 26 or-by reason of thefclutch member 26b between a freely mounted reversing gear 51 in operative relation with a gear 52 affixed to the shaft 39.

On the shift lever 49 is a cam member 53 adapted to actuate upwards a lever rod 5 4 which is springpressed downwards by a resilient member 55. The rod 54 may actuate the shifting fork 45a to throw the spindle shaft 46 into engagement with either of the bevel gears 43 or 44, as will be explained.

The rod 54 (Figure 12) is pivoted to a crank 56 which, together with a rocker 57, a sleeve 58 and a short rocker 59 (Fig. 15) are mounted on a rod 60 which may be pushed in and out by a button 61. The sleeve 58 is pinned to the lrod .60 and works in and out therewith. On the rear end of the sleeve 58 is a projecting key 58a adapted to project through a key slot 57a in the rocker 57 and into a key slot 56 in the lever 56 when the rod 60 is in its inmost position.

- A similar but shorter key 58b projects forward and is adapted to enter a key slot 59 in the short rocker 59 when the rod 60 is pulled to its outer position. With the rod 60 in its outmost position and the key 591 projecting forward completely in the short rocker 59, the key 58a is completely withdrawn from the crankv 56 and the rod 54 therefore is detached from engagement with the rocker arm 57 which actuates the clutch.

In this outer position of the rod 60 the short rocker is keyed to the rocker 57 and actuates the clutch 45, being itself actuated by a rocker lever 62 Ain conjunction with an arm 63.

I On the frame 1 of the grinding machine (Figure 1) for automatic reversing of the travel are adjustable stops 1, 1, adapted to contact with pins 64, 64 (Figure 14) which are slidably mounted in a yoke 64a and contact with an arm 63.*pivoted on shaft 63a Figure 12) and having a rearwardly pr 'ecting pin 65. A rocker lever 62pivoted as on a shaft 62a has a yoke end 62b into which the pin 65 projects, At the other end of the rocker 62 is mounted a beveled edge latch 66 normally in engagement with a spring pressed snap latch 66a. The end of the arm 63 projects into the yoke of the short rocker arm 59. j

The operation of this mechanism is as follows. When the frame 1 of the machine reaches. either desired extremity of its travel a. stop 1*l strikes a pin 64 and continued travel serves to press the pin forward to rock the arm 63 which, by reason of the pin 65 taking in the yoke end of the lever 62 moves the lever 62 slightly so that the beveled edge of the latch 66 rides by the edge of the snap latch 66a.

The latch 66a being suddenly released snapsforward and rocks the lever 62 and thus the arm 63 over to its extreme throw, actuating the short rocker 59 and through it the sleeve 58 and the rocker 57 and throwing the clutch 45 to the other one of the gears 43 and 44.

From the foregoing description it is seen that a motor may actuate the shaft 24 through the belt 23 and in turn through the worm 25 aetuate the worm gear 26. If the clutch 26a is then in engagement with the bevel 27 the shaft 29 is actuated. Any one of the gear reductions between shafts 29 and 30 may be selected by the operation of the handle 31 and the shaft 30 driven at the desiredl speed. A further selection of speed may be made between'the shafts 30 and 36 by the actuation of the handle 35 thus operating the bevel gear 37 and through it the bevel 38.

With the shift rod 49 over to hold the clutch 26*1 in engagement with the clutch of gear 27, the finger 48 will hold the clutch 47 in mesh with the clutch of gear 38 and the shaft 39-will rotate, the gear 40 aiixed thereto will actuate the gear 41 and thus the gear 42 and the gears 43 and 44.

By reason of the extreme position of shift lever 49 the cam 53 is in an extreme position such that the rod 54 will be downwardly depressed by the spring 55 and the elutch.45 will be in mesh with the clutch of gear 44 driving the spindle shaft 46 and thus the spindle 21 in forward cutting direction.

Actuation of the shift lever.49 to the other extremity as shown in Figure 12 will release the clutch 26a and the gear 26 will drive the gear 51 lthrough clutch 26" and with the step-up gear ratio indicated will drive shaft 39 at a high speed through gear 52 and, as before, drive the spindle gears 43, 44 through gear 40 and the intermediate gears and shafts.

In this case, however, the rodV 54 is raised. by the cani 53 and the clutch 45 will be actuated by the gear 43 to drive the spindle shaft in a reverse direction.

It is essential in the above described operation that the button 61 be fully pressed in so that the rod 54 actuating the crank 56 will be connected by the key 58a to the rocker arm 57 and thus actuate the clutch 45.

The shifting of the arm 49, (Figure 7) may be manually made 'by the operator through the crank 49a, the shaft 49", a crank 49c connected by a rod 49d, a crank 49e Figure 6 and a shaft 49t which is operable by a reverse shift handle 49g (Figure 9).

lt is apparent, therefor, that the revers f ing of the direction of rotation of-the spindle shaft may be done manually by the handle 49g through the rod 54 or automatically by t-he stops 1a, 1?, as described. Automatic reversal of direction, being done by lmere shifting of the clutch 45 through the stops l, 1a, will result in the same speed of rotation of the spindle in both directions, as the gears 43 and 44 are alike and grinding may take place in both directions of travel of the frame 1. Manual reversal or change4 of direction, as described, by means of the shift lever 49 jmay mean a higher reverse travel than the forward "travel, owing to the large gear ratiobetween the gears 51 and 52. A quick l return travel of the frame 1 may therefore be made, if desired, as in the case where cutting is desired only on the forward stroke of the frame 1.

`Mounted on the spindle shaft 46 is a -worm gear 67 constantly in mesh with a worm aixed to ashaft 68 (Fig. 1l) on which may be ailixed a gear 69 actuating a gear 7() which actuates a coacting gear 7l, a shaft 72 and a bevel gear 78. The latter actuates a cooperating bevel gear 74 slid- `ably aiixed to a shaft 75 as will be described. At the extremity of the shaft 75 is aiiixed a cam 76 having a follower 77 adjustably mounted on an arm 78 (Fig. 16) which is affixed to the cross carriage 6 and results in pushing the cross carriage transversely with an intermittent motion, a return of the carriage being accomplished by a pair of springs 79.

The cam 76 may be replaced, if desired, by one having a different number of actuating surfaces by loosening the nut 7 6a and sliding the cam off the shaft. In any longitudinal movement of the carriage 6, the cam 76 and its related parts move therewith by reason of the shaft 75 being adapted to slide in the bevel gear 74.

This mechanism is used in the cutting of hobs for the purpose of permitting the grinding wheel to follow the` desired contour ot lthe hob teeth which, asis Well known, are not completely concentric with the hob axis but are cut back on an arc from of the speed of shaft and by the number of actuating surfaces on cani 76.

In order to provide for cutting those hobs which are of a spiral nature or form it is desirable to continuously and automatically adjust the position of the cam 76 to correspond with the angle of the hob teeth desired, thus changing the phase relation betweeny t-he actuating cam 76 and the hob being cut.

This is accomplished by means of a sleeve 74a (Fig. 3) having a reduced portion 74", alixed to the gear 74 and turning therewith. A slot 7 4c is cut in the sleeve or collar 74a at an angle to the axis of said sleeve.

Afixed to shaft 75 is a pin 75a which rides in the slot 742 forming the driving means between gear 74 and shaft 75.

As has been explained, the movement of the frame 1 to which carriage 6 is affixed moves the shaft 75 slidably through the sleeve 74a and the gear 74.` This actlon results in pin 75*1L riding along Slot 74 in Vsuch a manner as to gradually turn shaft 7 5a phase increment in addition to the rotative action of gear. 74, sleeve 74 being held from longitudinal movement bv abutting a bearing against the shaft 75 .journal box.

It is apparent that the angle of slot 74c must correspond to the angle of the hob spiral cutting teeth edge and sleeves of various desired angles mav be substituted for the particular one shown in the drawings.

The casing enclosing gears 69, 70, and 71 may be removed as by loosening a latch button 80, whereupon other ratio of gears may be manually placed on the shaft 68, the stud 7 0 and, if required, on the shaft 72. Preferably and usually, however, the gear 69 is the only one that is changed, the pinion 70 (Figure 7) being mounted on a stud 70a slidably affixed in the arm 70 which may be swung about its support, in this case the journal of the shaft 68. Thusany gear, within limits, may be used in place of the gear 69 shown, if of the correct pitch, and gear 70 adjusted to mesh between it and the gear 71 on the shaft 72.

Thus, by manual change of gears, the speed of the shaft 75 may lie-varied.

The carriage 6 comprises a mounting for pivotally positioned as by thel studs 83, 83

and clamped over the journals as by the bolts 84, 84, taking in threaded holes in p the lower stationary clamping lingers 85, 85.

The fingers of one o-f said pairs of clamping fingers, (as for example the left hand pair in Fig. mounted as at 83 on 'the arcuate frame 90. The other'of said pair of clamping fingers (as for example the right hand pair in Fig. 2Q) is slidably adjustable in and out transversely between the guiding members 86, g

86 (Figs. 22 and 24) and may be clamped in position by the -nuts 87, 87. The purpose of this adjustment is to align the axis of the grinding wheel with the axis of the rotating piece to be cut or at any desired angle thereto.

The frame 90, carrying the journals in which the shaft 50a revolves, is mounted on arcuate guides 88 and may be adjusted about a horizontal transverse axis passing through wheel.

the center point of the cutting This adjustment is made by a screw Y 91, being itself held from longitudinal movement by a stud 91a taking in a groove 91b in the shank of the screw. The thread 91c of the screw meshes with a thread cut on the arcuate peripheryjof the frame 90.

A bolt 89- whose head rides in an arcuate slot in the frame 90 may be clamped by reason of the nut 89a and frictionally hold the frame 90 in set position.

The purpose of this adjustment is to incline the cutting wheel 50 as desired for the purpose of cutting very steep pitch hobs.

A longitudinal adjustment of the grinding wheel relatively to the carriage6 may be obtained by reason of the guides 92 and the clamping screws 93, 93.

A transverse movement of the carriage 6 by reason of the screw7 has already been described.

One of the essentials to the-grinding of perfect threads on hobs is that the cuttin surfaces lof the 'grinding wheel be in goo condition always and at an angle corresponding with the angle between the sides of the finished thread. It is essential also, when steep pitch hobs are cut as by turning the grinding wheel at an angle about a horizontal axis, "that the sides of the cutting wheel be properly trimmed to the proper angle with due allowance for the position of the wheel. To insure this we have devised a wlel trimmer which is illustrated in preferred embodiment particularly in Figures 26424 inclusive.

20) may both be pivotally vout transversely, preferably divided and a universal joint The trimmer mechanism is mounted in conjunction with the grinding wheel on the same base and moves with the wheel in transverse, arcuate and longitudinal adjustments so that it is ready at all positions to be used in trimming the wheel.

The details of construction of the trimmers and the various adjustments in the operation thereof are all described in a coending divisional application Serial No. 566,906 and these details therefore will not be vfurther described in this application.

When it is desirable to use a milling cutter for roughing'work previous to grinding,

a form of device as shown in Figs. 17, 18, 19, may be provided.

kA shaft 127 (Figs. 7 and 18) is driven from the main shaft through a change speed caring 128, a shaft 129, bevel gears 130, a shaft 131, a gear 132 and a gear 133 slidably afxed to shaft 127 which has a longitudinal movement by reason of the travel of the frame 1. The rotative speed of shaft 127 is therefore changeable by reason of the gear set 128.

A worm or spiral gear 134 on shaft 127 drives a cooperating gear 135 which by means of bevel gears 136, 137, 138, and coacting shafts 1361, 137", 138, actuates a cutter shaft 139 having aflixed' thereto a 'cutting tool, as, for example,... -a milling cutter.

In the modification of Fig. 19, gear 135, through shaft 136", spiral gears 136, shaft 137), and spiral gears 138", actuates the cutter shaft 139b and the rotary cutter 126.

To provide for feeding the cutter in and the slidable shaft 127 is aliixed therein (Fig. 17).

To provide for accurate adjustment of the cuttin tool, a cradle 141 is provided in which mil ing cutter block 142 rests and is adjustably held by clamping screws 143, 143, taking in arcuate grooves 144, 144, in the block. The block or head `is arcuately adjustable about the transverse center line of the cutter which intersectsthe line vof head and tail centers of the machine. A scale graduation is provided on the head and cradle to aid in setting the cutter.

It is apparent that the movement of the frame 1' longitudinally over the bed of the lathe will move the grinding wheel 50 or the rotary cutter 126 back and forth over the surface of the work to be finished, the pitch being determined by the pitch of the screw 4. and its coacting nut 3. The cutting tool, therefore, requires no other motion of itself than the proper transverse and arcuate adjustments previously mentioned and -a rotative motion limparted to it through the shaft127.

The speed of the rotating ground is widely adjustable m part to be the device as illustrated, giving a choice of six positions of the lever 25 for each of the three speeds set bythe lever 31 or a total of eighteen possible forward or reverse cutting speeds as well as the quick return speed operated by the lever 49g.

What we claim is l. ln a grinding machine of the character described, a rotatable shaft, means for attaching thereto a piece to be ground, a plurality of means for reversing 'the direction of rotation of said shaft, a frame, means to move said frame parallel to said shaft in either direction, a grinding wheel operatively aixed to said frame and means to rotate said grinding wheel, said reversing means comprising an automatic reversing mechanism actuated by the movement of the frame and a manually actuated reversing mechanism, said manually actuated reversing mechanism comprising means for increasing 'the speed of movement of said frame when traveling in the reverse direction.

'2. lin a grinding machine of the character described, a rotatable shaft, means for attaching thereto a 'piece to be ground, a plurality of means for reversing the direction of rotation of said shaft, a frame, means to move said frame parallel to said shaft in either direction, a grinding wheel operatively afiixed to said frame and means to rotate said grinding wheel, said reversing means comprising an automatic reversing mechanism actuated by vthe movement of the frame and a manually actuated reversing mechanism, said manually actuated reversing mechanism including means for selectively engaging either of said reversing means.

3. A grinding4 machine comprising a motor, a rotary shaft, means for attaching thereto a piece to be ground, gearing between said motor and said shaft for driving the shaft at different speeds, manual means for controlling the driving gearing, reversing gearing in operable relation to the shaft, a slidable frame guided to move parallel to the shaft, operable means between said shaft and said frame whereby the rotation of said shaft moves said frame, means on said frame for controlling said reversing gearing, other reversing gearing, manual means for controlling y said other reversing gearing, a grinding wheel, and an adjustable support for said wheel alixed to said slidable frame.

4. ln a grinding machine, a rotary shaft, means for attaching thereto. a piece to be ground, a slidable frame, a .grinding wheel, a support for said wheel affixed to said slidable frame, means to move said frame. at an exact predetermined speed with relation to the speed of said shaft, means to reverse the direction of travel of said frame actuated by said frame, means to guide said frame parallel to said shaft, an arcuate adjustment for said wheel support, a transverse adjustment for said wheel support, and a longitudinal adjustment for said wheel support. i

5. In a device of the character described, a motor, a rotatable shaft, means for attaching thereto a piece to be ground, a slidable frame, means to guide said frame, means affixed to said frame coacting with means affixed to said shaft whereby the rotation of said shaft slidably moves said frame in positive speed relation to the speed of said shaft, an operable connection between said motor and said shaft to rotate said shaft comprising a plurality of gears, a plurality of means for controlling the speed relation between said gears, means actuated by said frame to reverse the direction of rotation of said shaft, a grinding wheel adjustably mounted on said frame and means to rotate said wheel.

6. ln a grinding machine of the character described, a motor, a rotary shaft operatively connected thereto, means for attaching to said shaft a piece tobe ground, a frame, means to move said frame parallel to said shaft in either direction, a grinding wheel operatively affixed to said frame, means to rotate said grinding wheel transversely of the frame, and operative connections between said rotary shaft and said reciprocating means including a gear operatively co/nnected with the rotary shaft, a plurality of gears coacting with said gear, a shaft actuated by one of said plurality of gears and slidable therein, a cam actuated by said shaft and removably axed thereto, a follower for said cam adapted and arranged to reciprocate the grinding wheel and means to adjust the follower.

7. ln a grinding machine of the character described, a motor, a rotary shaft operatively connected thereto, means for'a'ttaching to said shaft a piece to be ground, a frame, means to move said fra-me parallel to said shaft in either direction, a grinding wheel operatively aixed to said frame, means-to rotate said grinding wheel, means to periodically reciprocate said grinding wheel transversely of said frame, and means to vary the periodicity of reciprocation of said grinding wheel.

8. In a grinding machine of the character described, a motor, a rotary shaft operatively connected thereto, means for attaching to said shaft a piece to be ground, a frame, means to move said frame parallel to said shaft in either direction, a grinding wheel operativelyatxed to said frame, means to rotate said grinding wheel, means to periodically recinrocate said grinding wheel transversely o said frame, and a plurality of means to vary the periodicity of reciprocation of said grinding wheel comlll pricing a cam, a plurality o actuating means on the cam and means to vary the speed of the cam.

9. ln a grinding machine of the character described a rotary shaft, a source of power for said shaft, a frame, means to slidably movel said frame parallel to saidshaft in positive speed relation to the speed of said shaft, a grinding wheel, a sup-port for said wheel slidably affixed to said frame, means to periodically reciprocate said grinding wheel support in positive time 'relation to the rotation ot said vary the amplitude ot reciprocation of said grinding wheel support.

10. ln a device of the character described a rotatable shaft, means for attaching thereto a piece to be shaped, a rotary cutting tool, means to rotate said tool, an operable connection between said shaft and said tool whereby' relative longitudinal motion is obtained between the piece to be shaped and the cutting tool, means ii'icluding a cam, to periodically reciprocate said tool transversely of the axis of said shaft and means to vary the phase relation between the relative angular position of said cam and the piece to be shaped.

1l. In a grinding machine, work holding means, means for rotating said work holding means, a tool holding trame. means for moving said frame longitudinally with respect to the work holding lneans, means for moving said tool holding frame transversely with respect tothe work holding means and means for changing the phase relation between the longitudinal and transverse movement of said tool holding frame.

12. ln a machine, rotary Work holding means, means for rotating said work holding means, a tool holding frame, means to move said frame longitudinally ott said Work holding means in either direction, means for' reciprocating said frame transversely of the Work holding means and means set in operation' by the longitudinal movement ot the tool holding means for controlling the reeiprocation ot the trame.

'13. ln a machine, rotarypwork holding means, means for rotating said work holding means, a tool holding frame, means to move said frame longitudinally of said Work holding means in either direction, means for reciprocating said frame transversely of the work holding means and means set in operation by the longitudinal movement of the tool holding means for controlling the recipshaft, and means to ocation of the frame by changing the phase relation of the reciprocating and longitudinal movement of the tool holding frame.

14. n a machine, rotary work holding means, means for rotating said work holding means, a tool holding frame, means to move said frame longitudinally ot said work holding means in either direction, means including a cam for reciprocating said frame transverselyY of the work holding means and means set in operation by the longitudinal movement of the tool holding means for controlling the rotation of the cam and the reciprocation of the frame.

15,. In a machine o the character described, rotary work holding means. a frame, means to move the frame parallel to the axis ot the work holding means in either direction, tool holding means on said frame, means to periodically reciprocate'said frame and means to vary the periodicity of reciprocation of said frame.

1G. In a machine of the character described, a work holding frame, a tool holding frame, means including operatively connected driving members for reciprocating said second frame'transversely of said first frame, means for moving the second frame longitudinally ot the -first trame` and means controlled by the movement of the second frame longitudinally of the first frame for varying the periodicity of the transverse reciprocation of the second frame.

17. In a machine ot the character described, a work holding frame, a tool holding frame. means including operatively connected driving members for reciprocating said second frame transversely of said rst frame, means for moving the second trame longitudinally of the first frame. and means controlled by the movement of the second frame longitudinally of the lirst frame for causing relative movement between said driving members and varying the periodicity ot the transverse reciprocation' ot the second frame. l

18. In a device of the character described, a shaft, a grinding wheel carried thereby, supporting means for the shaft and means for adjusting the shatt longitudinally, angularly about one end and arcuately about the center point of the wheel.

In'testimony whereof we hereunto attiX our signatures.

MATTHEW S. CUB'ENER. FREDERICK W. GEISSENHAINER. 

